Stephen Galloway, former principal dancer for Ballet Frankfurt, now uses his classic training to choreograph the world's top models—and the Rolling Stones

IN A DARK STUDIO inside New York's Chelsea Piers, model Edita Vilkeviciute, clad in lacy black lingerie, strikes a pose and aims a sultry look at the camera.

"Chin up!" instructs photographer Daniel Jackson, who is shooting a holiday fashion campaign. She shifts her hips from side to side and drops her left shoulder. Out of the corner of her eye, she watches the edge of the shadows where the slinky, six-foot-four figure of choreographer Stephen Galloway, 47, mirrors her every move. When she brings one foot...